33 lines
846 B
JavaScript
33 lines
846 B
JavaScript
'use strict';
|
|
|
|
var GetIntrinsic = require('../GetIntrinsic');
|
|
|
|
var $species = GetIntrinsic('%Symbol.species%', true);
|
|
var $TypeError = GetIntrinsic('%TypeError%');
|
|
|
|
var IsConstructor = require('./IsConstructor');
|
|
var Type = require('./Type');
|
|
|
|
// https://ecma-international.org/ecma-262/6.0/#sec-speciesconstructor
|
|
|
|
module.exports = function SpeciesConstructor(O, defaultConstructor) {
|
|
if (Type(O) !== 'Object') {
|
|
throw new $TypeError('Assertion failed: Type(O) is not Object');
|
|
}
|
|
var C = O.constructor;
|
|
if (typeof C === 'undefined') {
|
|
return defaultConstructor;
|
|
}
|
|
if (Type(C) !== 'Object') {
|
|
throw new $TypeError('O.constructor is not an Object');
|
|
}
|
|
var S = $species ? C[$species] : void 0;
|
|
if (S == null) {
|
|
return defaultConstructor;
|
|
}
|
|
if (IsConstructor(S)) {
|
|
return S;
|
|
}
|
|
throw new $TypeError('no constructor found');
|
|
};
|